hi guys I'm new to here, so hello to you all. I have a british 2000 V turbo, it has quite a noticable misfire, it idles a bit lumpy and when i drive it feels very hesitant in all gears but clears momentarily. It has been standing a couple of months, but I've just drove it for 50 miles as hard as I could given the way it's running and it hasn't cleared. Any advice?